Antenna assembly and electronic device

Abstract

This application relates to an antenna assembly and electronic device, including a feed, a first radiator, and a second radiator. On one hand, a second gap exists between the first and second radiators, enabling gap coupling and solving the problem of low antenna radiation efficiency. On the other hand, the first radiator has at least one first gap, which can be divided into multiple radiating branches. The feed can excite gap coupling between adjacent radiating branches and excite gap coupling between the second radiating branch and the second radiator. This allows the antenna assembly to support a dual-resonance mode, operating in a main resonant mode generated by the joint excitation of the first and second radiators and a parasitic resonant mode generated by the excitation of the second radiator. This significantly improves the in-band radiation efficiency of the main branch, enhances the head-and-hand performance of the main resonant mode in the supported frequency band, increases the flexibility of early stacking and later debugging, solves the FPC mounting problem, improves feasibility, and enhances antenna consistency.

Description

Technical Field

[0001] This application relates to the field of antenna technology, and in particular to an antenna assembly and electronic device. Background Technology

[0002] With the development of 5G and future 6G communication technologies, mobile devices have increasingly higher requirements for data transmission rates, bandwidth, antenna frequency band coverage, and signal stability. FPC (Flexible Printed Circuit) antennas, with their lightweight and miniaturized design, support for multiple frequency bands, flexible layout, and high transmission performance, have become one of the mainstream technologies for smartphone antennas, effectively improving the communication performance and user experience of mobile phones.

[0003] However, due to the limitations of the overall size, FPC antennas suffer from poor efficiency. Summary of the Invention

[0004] This application provides an antenna assembly and electronic device that can improve the radiation efficiency of an FPC antenna.

[0005] The first aspect of this application provides an antenna assembly, including:

[0006] A first radiator has at least one first slit, the first slit dividing the first radiator into at least a first radiating branch and a second radiating branch, the first radiating branch having a feed end away from the first slit.

[0007] The second radiator is located on the side of the first radiator away from the feed end, forming a second gap between it and the second radiating branch, and the second radiator has a grounding end away from the second gap;

[0008] The feed source, connected to the feed terminal, is used to excite the first radiator and the second radiator to support operation in a dual-resonance mode. The dual-resonance mode includes a main resonant mode generated by the joint excitation of the first radiator and the second radiator, and a parasitic resonant mode generated by the excitation of the second radiator. The main resonant mode and the parasitic resonant mode support different frequency bands.

[0009] A second aspect of this application provides an electronic device, comprising:

[0010] floor;

[0011] As described above, in the antenna assembly, the grounding terminal is connected to the floor.

[0012] The aforementioned antenna assembly and electronic equipment include a feed, a first radiator, and a second radiator. On one hand, the first radiator is the main radiator, and the second radiator is a parasitic radiator. There is a gap between the first and second radiators, which allows for gap coupling. Compared to the IFA mode antenna, the addition of a parasitic radiator solves the problem of low antenna radiation efficiency. On the other hand, the first radiator has at least one first gap, which can be divided into multiple radiating branches. The feed can excite gap coupling between adjacent radiating branches and excite gap coupling between the second radiating branch and the second radiator. This allows the antenna assembly to support a dual-resonance mode, which is a main resonant mode generated by the joint excitation of the first and second radiators and a parasitic resonant mode generated by the excitation of the second radiator. Thus, each state can have two resonant waves, which can significantly improve the in-band radiation efficiency of the main branch and improve the head-and-hand performance of the main resonant mode in the supported frequency band. At the same time, multiple radiating branches solve the problem of excessive branch length, increase the flexibility of early stacking and later debugging, solve the FPC mounting problem, improve feasibility, and enhance antenna consistency. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is one of the structural block diagrams of an antenna assembly according to an embodiment of this application;

[0015] Figure 2 This is a second structural block diagram of an antenna assembly according to an embodiment of this application;

[0016] Figure 3 This is a third structural block diagram of an antenna assembly according to an embodiment of this application;

[0017] Figure 4 This is the fourth structural block diagram of an antenna assembly according to an embodiment of this application;

[0018] Figure 5 This is a structural block diagram of the middle frame of an embodiment of this application;

[0019] Figure 6 This is one of the structural block diagrams of an electronic device according to an embodiment of the related technology;

[0020] Figure 7 This is a second structural block diagram of an electronic device according to an embodiment of the related technology;

[0021] Figure 8S-parameter curves and system performance curves of an antenna assembly operating in the B5 band, according to an embodiment of the related technology;

[0022] Figure 9 A system performance curve of an antenna assembly operating in the B8 band, according to an embodiment of the related technology;

[0023] Figure 10 This is one of the structural block diagrams of an electronic device according to an embodiment of this application;

[0024] Figure 11 S-parameter curves and system performance curves of an electronic device operating in the B5 / B8 / B28 frequency bands according to an embodiment of this application;

[0025] Figure 12 This is a second structural block diagram of an electronic device according to an embodiment of this application;

[0026] Figure 13 This is the third structural block diagram of an electronic device according to an embodiment of this application. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0028] It is understood that the terms "first," "second," etc., used in this application may be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified. When an element is considered to be "connected" to another element, it may be directly connected to the other element or there may be an intervening element present.

[0029] The antenna components described in this application can be applied to electronic devices with wireless communication capabilities. These electronic devices can be handheld devices, in-vehicle devices, smart cars, wearable devices, computing devices, or other processing devices connected to a wireless modem, as well as various forms of user equipment (UE) (e.g., mobile phones), mobile stations (MS), etc. For ease of description, the devices mentioned above are collectively referred to as electronic devices.

[0030] Figure 1This is a structural block diagram of an antenna assembly according to one embodiment, with reference to... Figure 1 In this embodiment, the antenna assembly includes: a feed source S, a first radiator 10, and a second radiator 20.

[0031] A first radiator 10 has at least one first slit F1 (illustrated as an example of a first radiator 10 having a first slit F1). The first slit F1 divides the first radiator 10 into at least a first radiating stub 110 and a second radiating stub 120. The first radiating stub 110 has a feed terminal (K in the figure) away from the first slit F1, and the feed terminal is connected to a feed source S. A second radiator 20 is located on the side of the first radiator 10 away from the feed terminal, forming a second slit F2 between it and the second radiating stub 120. The second radiator 20 has a ground terminal (D in the figure) away from the second slit F2. The feed source S is connected to the feed terminal and is used to excite the first radiator 10 and the second radiator 20 to support operation in a dual-resonance mode. The dual-resonance mode includes a main resonant mode generated by the joint excitation of the first radiator 10 and the second radiator 20, and a parasitic resonant mode generated by the excitation of the second radiator 20. The main resonant mode and the parasitic resonant mode support different frequency bands.

[0032] The first radiator 10 has at least one first slit F1, each first slit F1 can divide a portion of the first radiating branch 110 into two adjacent radiating branches. At least, the first radiator 10 has one first slit F1 that can divide the first radiator 10 into a first radiating branch 110 and a second radiating branch 120. The first radiating branch 110 has a feed end, which can be understood as one end of the first radiator 10. The second radiating branch 120 has a free end near the second radiator 20, which can be understood as the other end of the first radiator 10.

[0033] It can be understood that when there are multiple first slits F1, the first radiating branch 110 can be understood as the first radiating branch formed by the division of the first radiator 10 near one of its ends, and the second radiating branch 120 can be understood as the radiating branch of the first radiator 10 near the end of the second radiator 20. The second radiator 20 forms a second slit F2 between itself and the second radiating branch 120 in the first radiator 10 at a position away from the feed end, and returns to ground at its end away from the feed end. Thus, the first radiator 10 and the second radiator 20 can be understood as a radiating conductor forming multiple radiating branches separated by slits through at least one first slit F1 and one second slit F2.

[0034] The feed source S is connected to the feed terminal of the first radiator 10, and can feed a feed signal into the first radiator 10, so that each radiating branch of the first radiator 10 is coupled to each other through the first slit F1, and coupled to the second radiator 20 through the second slit F2. During the coupling process between the aforementioned radiating branches and radiators, the first radiator 10 and the second radiator 20 support operation in a dual-resonance mode. The dual-resonance mode includes the main resonance mode generated by the joint excitation of the first radiator 10 and the second radiator 20, and the parasitic resonance mode generated by the excitation of the second radiator 20.

[0035] It can be understood that the main resonant mode is a resonant mode generated by the joint excitation of the two radiators, mainly contributed by the resonance of the first radiator 10, with a relatively wide bandwidth, and the supported frequency band corresponds to the main frequency band of the antenna assembly; the parasitic resonant mode is a resonant mode generated by the split coupling excitation of the second radiator 20, mainly contributed by the resonance of the second radiator 20, and the supported frequency band corresponds to the parasitic frequency band of the antenna assembly, which can significantly improve the radiation efficiency within the main stub band. The main frequency band and the parasitic frequency band are different. Optionally, the main frequency band can be a low-frequency (LB) band, which can include at least one of the following frequency bands: B / N5, B / N8, B / N12, B / N13, B / N14, B / N17, B / N18, B / N19, B / N20, B / N26, and B / N28A. Optionally, the first frequency band can also be other frequency bands, such as intermediate frequency (MB) band, high frequency (HB) band, ultra-high frequency (UHB) band, Wi-Fi 2.4G / 5G, GPS L1 / L5 band, etc.

[0036] The widths of the first fracture F1 and the second fracture F2 can satisfy the boundary conditions for mutual coupling between adjacent radial branches. Optionally, the size of each fracture can be in the range of 1.5mm-2mm, or in the range of less than 1mm, for example, in the range of 0.1-0.5mm. It can be understood that before the coupling reaches the threshold, the smaller the fracture between adjacent branches, the greater the coupling between the two radial branches.

[0037] On the one hand, the design of at least one first slot F1 in the first radiator 10 allows multiple radiating branches of the first radiator 10 to couple with each other during the main resonant mode resonance process, resulting in better coupling and improved bandwidth and / or antenna efficiency. The multiple radiating branches are separated by the first slot F1, and the multiple radiating branches can be mounted in segments, which is beneficial to the mounting of the first radiator 10. In particular, when the first radiator 10 and the second radiator 20 are FPC radiators, it can increase the flexibility of early stacking and later debugging, solve the FPC mounting problem, and improve antenna consistency. On the other hand, combined with the first slot F1 and the second slot F2, the antenna assembly has multiple slot coupling positions, and the first radiator 10 and the second radiator 20 can support dual operating modes. In dual operating modes, each state has two resonant waveforms with higher bandwidth, and the parasitic resonant mode can significantly improve the in-band radiation efficiency of the main branch.

[0038] In one implementation of the related technology, taking the low-frequency band as an example, the LB antenna mode is usually a typical IFA mode, which suffers from low antenna LB radiation efficiency and a relatively high head-hand drop. In another implementation of the related technology, a main branch and a parasitic branch are coupled to each other. Due to the overall size, the positions of the spring contacts on the motherboard and the small board are fixed, which also fixes the grounding position, resulting in an excessively long FPC antenna. If the coupling position is moved towards the grounding end when the FPC antenna is too long, the main branch will become too long, causing some frequencies to deteriorate. If the coupling position is moved towards the feed end, the parasitic branch will become too long, causing parasitic modes to fall into the in-band, affecting sideband efficiency. Furthermore, an excessively long FPC antenna can easily lead to misalignment or breakage, affecting antenna performance and making it difficult to guarantee consistency. Moreover, the coupling position needs to be locked during the initial stacking design, which is not conducive to subsequent debugging.

[0039] The antenna assembly provided in this embodiment includes a feed S, a first radiator 10, and a second radiator 20. On one hand, the first radiator 10 is the main radiator, and the second radiator 20 is a parasitic radiator. A gap exists between the first radiator 10 and the second radiator 20, allowing for gap coupling. Compared to a related embodiment, the addition of a parasitic radiator solves the problem of low antenna radiation efficiency. On the other hand, the first radiator 10 has at least one first gap F1, which can divide it into multiple radiating branches. The feed S can excite gap coupling between adjacent radiating branches and excite the second radiator 20. The radiating stub 120 is coupled to the second radiator 20 with a gap, enabling the antenna assembly to support a dual-resonance mode, which is the main resonant mode generated by the joint excitation of the first radiator 10 and the second radiator 20, and the parasitic resonant mode generated by the excitation of the second radiator 20. Thus, each state can have two resonant waves, which can significantly improve the in-band radiation efficiency of the main stub, improve the freedom and head-and-hand performance of the main resonant mode in supporting frequency bands, and solve the problem of excessive stub length. At the same time, multiple radiating stubs solve the problem of excessive stub length, increase the flexibility of early stacking and later debugging, solve the FPC mounting problem, have higher feasibility, and improve antenna consistency.

[0040] In one embodiment, the main resonant mode includes a hybrid mode of a first mode and a second mode, with the current of the first mode distributed in the first radiating branch 110 and the current of the second mode distributed in the entire arm of the first radiator 10 and the second radiator 20; the current of the parasitic resonant mode is distributed in the second radiator 20.

[0041] When the feed source S provides a feed signal, the feed signal is fed in from the feed end, exciting the first radiating stub 110 of the first radiator 10 to generate a first mode in which the current is distributed in the first radiating stub 110; simultaneously, it excites the mutual coupling between the radiating stubs of the first radiator 10 and the coupling between the first radiator 10 and the second radiator 20, generating a second mode in which the current is distributed across the entire arm of the first radiator 10 and the second radiator 20; in addition, during the coupling excitation process, the second radiator 20 can also generate a parasitic resonant mode in which the current is distributed across the second radiator 20. Among them, the current distribution generated by the first mode in the first radiating stub 110 exhibits the characteristics of a monopole antenna, which can effectively radiate electromagnetic waves and has high radiation efficiency; the current distribution generated by the second mode across the entire arm can provide a wider bandwidth; the hybrid mode formed by the first mode and the second mode can broaden the radiation efficiency of the antenna assembly and also increase the bandwidth.

[0042] In one embodiment, such as Figure 2(Taking the first radiator 10 with a first slit F1 as an example, the arrows in the figure indicate the direction of current flow. If arrows are mentioned in the following figures, they all indicate the direction of current flow and will not be repeated.) As shown, the first mode includes a quarter-wavelength mode from the feed end to the free end of the first radiating branch 110, and the second mode includes a circulating mode from the feed end to the ground end and from the ground end to the feed end; wherein, the first wavelength is the wavelength of the center frequency corresponding to the frequency band supported by the main resonant mode.

[0043] When the feed source S provides a feed signal, the feed signal is fed in from the feed end. The first radiating branch 110 of the first radiator 10 generates a surface current from the feed end to the free end of the first radiating branch 110 (current 1 represented by a single solid line in the figure), causing the first radiating branch 110 to operate in quarter-wavelength mode, which has high electromagnetic wave transmission and reception efficiency. The first radiating branch 110 of the first radiator 10 also generates surface currents from the feed end to the ground end and from the ground end to the feed end (current 2 represented by a dashed line in the figure, the dashed line is only for easy distinction from other currents), forming a bidirectional current, so that the first radiator 10 and the second radiator 20 work together in a bidirectional loop mode, and the entire antenna arm radiates, which can provide a wider bandwidth. The hybrid mode formed by the quarter-wavelength mode and the loop mode can broaden the radiation efficiency of the antenna assembly and also improve the bandwidth.

[0044] In one embodiment, please continue to refer to Figure 2 The parasitic resonance mode includes a quarter-wavelength mode from the ground end to the free end of the second radiator 20; wherein, the second wavelength is the wavelength of the center frequency corresponding to the frequency band supported by the parasitic resonance mode, and the frequency band supported by the parasitic resonance mode is higher than the frequency band supported by the main resonance mode.

[0045] When the feed source S provides a feed signal, the feed signal is fed in from the feed terminal, exciting the first radiator 10 to generate a current. During this process, the second radiator 20 is coupled to the first radiator 10 through the second slit F2. During the coupling process, the second radiator 20 will also generate a surface current. Part of the current flows from the ground terminal to the free end of the second radiator 20 (current 3 represented by double solid lines in the figure), so that the first radiating stub 110 operates in a quarter-wavelength mode. This quarter-wavelength mode has a high electromagnetic wave transmission and reception efficiency, which can enhance the coupling between the second radiator 20 and the first radiator 10. In addition, since the frequency band supported by the parasitic resonance mode is higher than the frequency band supported by the main resonance mode, and the second wavelength is greater than the first wavelength, the frequency band supported by the parasitic resonance mode can be adjusted so that it does not fall into the band of the frequency band supported by the main resonance mode, thereby improving the sideband efficiency.

[0046] In one embodiment, the main resonant mode supports a first frequency band, and the parasitic mode supports a second frequency band; the extension dimension of the first radiating stub 110 is a quarter wavelength of the center frequency corresponding to the first frequency band, and the extension dimension of the second radiator 20 is a quarter wavelength of the center frequency corresponding to the second frequency band.

[0047] Specifically, the extension dimension of the first radiating stub 110 corresponds to the position of the first slot F1 near the feed end, and the extension dimension of the second radiator 20 corresponds to the position of the second slot F2 near the ground end. Therefore, the opening positions of the first slot F1 and the second slot F2 can be adjusted based on the main resonant mode supporting the first frequency band and the parasitic mode supporting the second frequency band. For example, when the frequency band to be supported decreases, the extension dimension of the first radiating stub 110 is longer, thus the position of the first slot F1 is farther from the feed end.

[0048] Optionally, when the frequency bands supported by the two operating modes remain unchanged, the number of first slots F1 can be determined according to actual needs. During the process of the feed S exciting the first radiator 10 and the second radiator 20 to generate a resonant mode, each first slot F1 and second slot F2 can be equivalent to a capacitor. Multiple slots are equivalent to multiple capacitors connected in series. When the width and coupling area of ​​the slots remain unchanged, each additional first slot F1 is equivalent to adding another capacitor in series, reducing the coupling but increasing efficiency. When the coupling decreases, the bandwidth increases. Therefore, the specific number of first slots F1 can be determined according to actual bandwidth and efficiency requirements to achieve wider bandwidth and / or higher efficiency. For example, when the antenna assembly has one first slot F1 and one second slot F2, it can achieve wider bandwidth and higher efficiency.

[0049] In one embodiment, the coupling at the locations of the first fracture F1 and the second fracture F2 includes any one of gap coupling, layered coupling, and interdigital coupling.

[0050] Slot coupling achieves coupling through a gap between two conductors, utilizing the concentration of electric and / or magnetic fields in the gap to transfer energy. It can achieve a wide bandwidth, offers high design flexibility, and can adapt to different antenna layouts. Stacked coupling also utilizes the interaction of electromagnetic fields to achieve coupling, improving gain and radiation efficiency with minimal impact on bandwidth. It is suitable for applications requiring high gain and is easier to mount in FPC antenna form. Interfinite coupling uses alternating conductor fingers to couple, utilizing the electric field interaction between adjacent conductors. It provides good electromagnetic compatibility and bandwidth characteristics, easily achieves compact layouts, and is suitable for miniaturized designs.

[0051] Therefore, the antenna assembly of this embodiment, by opening the first slit F1 and the second slit F2, allows for the selection of corresponding coupling methods at different slit locations according to actual needs, making it suitable for different radiation and engineering requirements.

[0052] In one embodiment, the first radiator 10 and the second radiator 20 extend in the same direction. In this direction, the size of the first radiating stub 110 is larger than the size of the second radiator 20, and the size of the second radiator 20 is larger than the size of the second radiating stub 120. The relatively longer extension of the first radiating stub 110 compared to the second radiating stub 120 ensures that the first radiating stub 110 connected to the feed S serves as the main stub contributing to the main resonance, responsible for the primary radiation function and providing better radiation efficiency.

[0053] In one embodiment, such as Figure 3 As shown, the antenna assembly further includes at least one of a first tuning circuit 30 and a second tuning circuit 40. Figure 3 (The antenna assembly includes a first tuning circuit 30 and a second tuning circuit 40 as an example.)

[0054] The first tuning circuit 30 is connected to the feed source S and the feed terminal, respectively. The antenna assembly is configured to support the adjustment of the center frequency of the main resonant mode through the first tuning circuit 30, so as to support the switching of the first frequency band covered by the main resonant mode. The second tuning circuit 40 is connected to the ground terminal and the ground plane, respectively. The antenna assembly is configured to support the adjustment of the center frequency of the parasitic resonant mode through the second tuning circuit 40, so as to support the switching of the second frequency band covered by the parasitic resonant mode.

[0055] The first frequency band can be understood as a preset frequency range centered on the center frequency of the main resonant mode, and the second frequency band can be understood as another preset frequency range centered on the center frequency of the parasitic resonant mode. The adjustment of the first tuning circuit 30 and the second tuning circuit 40 can include adjusting at least one of the resonant frequency and bandwidth of the resonant mode. By configuring the circuit parameters of the first tuning circuit 30 and the second tuning circuit 40, the resonant frequency and bandwidth can be adjusted to correspondingly adjust the resonant position of the center frequency of the main resonant mode and the parasitic resonant mode, as well as the preset frequency range centered on the center frequency, thereby adjusting the frequency band covered by each resonant mode.

[0056] Optionally, the first frequency band may include multiple sub-frequency bands, each with a different center frequency. By adjusting the first tuning circuit 30, the center frequency of the main resonant mode can be switched, thereby switching different sub-frequency bands of the first frequency band.

[0057] Optionally, the second frequency band may include multiple sub-frequency bands, each with a different center frequency. By adjusting the second tuning circuit 40, the center frequency of the parasitic resonance mode can be switched, thereby switching between different sub-frequency bands of the second frequency band.

[0058] Therefore, by configuring the circuit parameters of the first tuning circuit 30, the antenna assembly can be switched between multiple different frequency bands supported by the main resonant mode; by configuring the circuit parameters of the second tuning circuit 40, the antenna assembly can be switched between multiple different frequency bands supported by the parasitic resonant mode.

[0059] Optionally, the first tuning circuit 30 may include a unit with tuning function composed of components such as capacitors and inductors. The circuit parameters can be understood as tuning parameters formed by the combination of equivalent capacitance, equivalent inductance, etc., obtained after the actual connection of the internal components of the first tuning circuit 30. For example, in this embodiment, a capacitor feed can be used to achieve the tuning function through different capacitors. Optionally, when a capacitor feed is used, different capacitors can be set to be connected to the switching unit. The switching unit switches the capacitor connected to the feed terminal to achieve adjustment of resonant frequency, bandwidth, etc.

[0060] In one embodiment, the center frequency of the main resonant mode is in the low-frequency range, and the first frequency band includes any one of the B8, B5, and B28 frequency bands; wherein, under the excitation of the feed source S, the main resonant mode supports operation in the B8 frequency band; after the feed signal provided by the feed source S is adjusted and processed by the first tuning circuit 30, the first frequency band is switched to any one of the B5 and B28 frequency bands.

[0061] Specifically, by adjusting the position of the first slit F1, the initial resonance of the first radiating stub 110 can be made to fall in the B8 frequency band. When the first tuning circuit 30 performs tuning processing, that is, when switching between different circuit parameters, the operating frequency band of the main resonant mode can be switched to either the B5 or B28 frequency band. Optionally, in this embodiment, a method can be adopted... Figure 4 The first tuning circuit 30 shown in the figure has a capacitor C connected in series in the power supply path, so that the resonance operates in the initial frequency band. When the parallel connection between capacitor C and capacitors C2, C3 and C4 is switched by the switching unit, the operating frequency band of the main resonance mode is switched to either the B5 band or the B28 band. When the series connection between capacitor C and capacitor C1 is switched by the switching unit, the bandwidth can be adjusted.

[0062] In one embodiment, the antenna assembly includes a first tuning circuit 30 and a second tuning circuit 40, which synchronously adjust the center frequency of the main resonant mode and the center frequency of the parasitic resonant mode to support dual-band switching of the first and second frequency bands.

[0063] Synchronization can be understood as the second tuning circuit 40 simultaneously adjusting the center frequency of the parasitic resonant mode while the first tuning circuit 30 adjusts the center frequency of the main resonant mode. Since the first tuning circuit 30 supports adjusting the center frequency of the main resonant mode and the second tuning circuit 40 supports adjusting the center frequency of the parasitic resonant mode, both the first and second frequency bands can be switched. This allows for widening the overall bandwidth of the antenna assembly while achieving a dual-wavelength switchable effect, thus fulfilling the need for more frequency band combinations.

[0064] It should be noted that dual-wave switching here can include at least one of the center frequency switching of the main resonant mode and the center frequency switching of the parasitic resonant mode. When the center frequencies corresponding to the two modes switch simultaneously, it can be understood as dual-wave switching. When switching between different center frequencies in the main resonant mode, switching between different first frequency bands can be supported; when switching between different center frequencies in the parasitic resonant mode, switching between different second frequency bands can be supported; when switching the center frequency in both operating modes, switching between different first and second frequency bands can be supported.

[0065] In one embodiment, when the first tuning circuit 30 adjusts the center frequency of the main resonant mode to a first preset frequency, the second tuning circuit 40 supports adjusting the center frequency of the parasitic resonant mode to a second preset frequency.

[0066] Wherein, the first preset frequency is less than the second preset frequency, and the difference between the first preset frequency and the second preset frequency is within the preset frequency range. This preset frequency range can be understood as the range that can improve the in-band radiation efficiency of the main resonant mode.

[0067] By switching the center frequency of the main resonant mode to a first preset frequency and the center frequency of the parasitic resonant mode to a second preset frequency, and the first preset frequency is less than the second preset frequency, and the difference between the first preset frequency and the second preset frequency is within the preset frequency range, the radiation of the parasitic resonant mode can improve the in-band radiation efficiency of the main resonant mode and enhance the radiation performance.

[0068] Optionally, the preset frequency range may include 100MHz-400MHz. Within this preset range, the in-band radiation efficiency of the parasitic resonant mode over the main resonant mode can be significantly improved, thereby significantly improving the radiation performance of the electronic device 10. For example, when the first frequency band includes any one of the B8, B5, and B28 frequency bands, the center frequency of the second frequency band may be 1.1-1.2GHz.

[0069] It should be noted that the first radiator 10 and the second radiator 20 in the above embodiments are not limited to FPC radiators, and can also be one of the following: a metal radiator formed by a metal frame seam, a laser direct-structuring (LDS) antenna radiator, or a print direct-structuring (PDS) antenna radiator. It is understood that the above embodiments of this application are for illustrative purposes only and do not limit the position and number of antennas. More antennas as shown in any of the above embodiments can be set in the whole device to achieve intelligent switching.

[0070] It should be noted that the free end in the above embodiments can be understood as an open end, an open circuit end, or an open terminal; the feed end can be understood as the feed point used to connect the feed source S located at the end of the radiating stub; the ground end can be understood as the ground point used to connect the ground to the ground located at the end of the radiating stub. The end can be understood as the end of the radiating stub, or it can be understood as a section of the radiating stub including the end.

[0071] This application also provides an electronic device, including: a floor; and an antenna assembly as described in any of the preceding claims, with its grounding terminal connected to the floor. The antenna module in the electronic device has a simple structure, high radiation efficiency, and widened bandwidth, which is beneficial for improving the communication function of the electronic device.

[0072] In one embodiment, such as Figure 5 As shown, the electronic device further includes a middle frame 50, which includes a middle plate 510 and a top frame 521, a first side frame 523, a bottom frame 522, and a second side frame 524 sequentially connected to the ends of the middle plate 510. A corner is formed between adjacent frames, and the middle plate 510 has a floor (not shown in the figure). Optionally, in the above embodiment, the first radiator and the second radiator can be separately disposed on the rear-view side of the entire electronic device. This rear-view side can be, for example, a side frame.

[0073] The middle board 510 can be used to install electronic components such as batteries, motherboards, small boards, and camera modules for electronic devices. The motherboard can integrate electronic components such as processors, storage units, power management modules, and baseband chips. The motherboard and small board can be PCBs (Printed Circuit Boards) or FPCs. In the above embodiments, the ground plane can be a metal ground plane on the motherboard or small board, thereby providing a ground plane. Radio frequency circuitry for processing radio frequency signals can be integrated on the circuit board, as can controllers for controlling the operation of electronic devices.

[0074] The following comparison of embodiments of related technologies with the above embodiments is provided to further explain and illustrate the above embodiments:

[0075] like Figure 6 As shown, Example 1 of the related technologies is that the LB antenna is in IFA mode, which has the problem of low LB radiation efficiency and a relatively high head-to-hand drop of about 7-8dB.

[0076] like Figure 7 As shown, Example 2 of the related technology includes a main branch and parasitic branches, and the excitation mode is as follows: Figure 8 As shown, compared to the related technology example 1, although efficiency and BHH performance are improved (radiation efficiency improved by about 3dB, head and hand reduction optimized by 1.5-2dB), due to the overall size, the positions of the spring contacts on the main board and the small board are fixed, and the total length of the FPC antenna is about 120mm. If the coupling position is moved towards the ground end, the B8 efficiency will deteriorate; if the coupling position is moved towards the feed end, the parasitic mode will fall into the in-band, affecting the sideband efficiency. Figure 9 As shown; furthermore, the antenna mounting process can easily lead to the FPC antenna being misaligned or broken, affecting antenna performance, making it difficult to guarantee consistency, and the coupling position needs to be locked in the early stacking design, which is not conducive to subsequent debugging.

[0077] like Figure 10 As shown, in Optional Example 1 of this application, taking a first radiator with a first slit F1 as an example, the first radiator includes a first radiating stub 110 and a second radiating stub 120, and a second slit F2 is formed between the second radiating stub 120 and the second radiator 20. The position of the first slit F1 is adjusted according to the resonant wavelength of the long stub, and the distance from the second slit F2 to the ground terminal is approximately 40mm, which can be fixed during the initial stacking. In this embodiment, the distance between the first slit F1 and the second slit F2 is approximately 15mm, which can be adjusted according to actual debugging. Because the overall FPC length of the first and second radiators is too long, it can be divided into three segments for mounting as needed, increasing the flexibility of initial stacking and subsequent debugging, solving the FPC mounting problem, improving feasibility, and enhancing antenna consistency.

[0078] like Figure 11 The figure shows the simulation results of the S-parameters and radiation efficiency of the LB band in Optional Example 1 of this application. It can be seen that there are two resonant waveforms in each state. The first waveform is a mixed mode of the 1101 / 4 wavelength mode of the first radiating stub and the whole arm ring mode, with a relatively wide bandwidth. The second waveform is the resonant waveform of the parasitic stub, which can significantly improve the radiation efficiency within the main stub band. Without distinguishing between transmission (TX) and reception (RX), the average radiation efficiency of B28 is about -7dB, while the average radiation efficiency of B5 and B8 is within -4dB.

[0079] Therefore, Option Example 1 of this application can solve the problems of poor antenna performance and high head-and-hand reduction in Option Example 1 of related technologies. Referring to Table 1 below, the comparison of simulation results of radiation efficiency in the LB band in Table 1 shows that Option Example 1 of this application has a certain degree of improvement in low-frequency radiation efficiency, with B28 improving by about 1.5dB, and B5 and B8 both improving by more than 2.5dB, and the head-and-hand reduction is optimized by 1-2dB. Option Example 1 of this application can also solve the problems of excessively long FPC and difficult design and debugging in Option Example 2 of related technologies.

[0080] Table 1. Simulation results of LB radiation efficiency of optional example 1 of this application and related art optional example 1.

[0081]

[0082] Therefore, Option Example 1 of this application can extend the bandwidth of the LB band, improve the flexibility and head-and-hand performance of the LB band, and has higher engineering feasibility and better consistency.

[0083] like Figure 12 As shown, in Option Example 2 of this application, based on the original fracture position and frequency band remaining unchanged in Option Example 1, an additional first fracture F1 can be opened on the second radiating branch 120 of Option Example 1 of this application, dividing it into an intermediate radiating branch and a new second radiating branch 120. Option Example 2 of this application has higher radiation efficiency than Option Example 1 of this application.

[0084] like Figure 13 As shown, further, taking the aforementioned electronic device as mobile phone 11 as an example for explanation, specifically, as follows... Figure 13 As shown, the mobile phone 11 may include a memory 21 (which optionally includes one or more computer-readable storage media), a processor 22, a peripheral device interface 23, a radio frequency system 24, and an input / output (I / O) subsystem 26. These components optionally communicate via one or more communication buses or signal lines 29. Those skilled in the art will understand that... Figure 13 The mobile phone 11 shown does not constitute a limitation on the mobile phone and may include more or fewer components than shown, or combine certain components, or have different component arrangements. Figure 13 The various components shown are implemented in hardware, software, or a combination of both, including one or more signal processing and / or application-specific integrated circuits.

[0085] Memory 21 optionally includes high-speed random access memory, and also optionally includes non-volatile memory, such as one or more disk storage devices, flash memory devices, or other non-volatile solid-state memory devices. Exemplary examples include software components stored in memory 21 such as an operating system 211, a communication module (or instruction set) 212, a global positioning system (GPS) module (or instruction set) 213, etc.

[0086] The processor 22 and other control circuits can be used to control the operation of the mobile phone 11. The processor 22 can be based on one or more microprocessors, microcontrollers, digital signal processors, baseband processors, power management units, audio codec chips, application-specific integrated circuits, etc.

[0087] The processor 22 can be configured to implement control algorithms for controlling the use of the antenna in the mobile phone 11. The processor 22 can also issue control commands for controlling various switches in the radio frequency system 24.

[0088] I / O subsystem 26 couples input / output peripherals on mobile phone 11, such as a keypad and other input control devices, to peripheral interface 23. I / O subsystem 26 optionally includes a touchscreen, buttons, a tone generator, an accelerometer (motion sensor), an ambient light sensor and other sensors, LEDs and other status indicators, data ports, etc. For example, a user can control the operation of mobile phone 11 by supplying commands via I / O subsystem 26, and can use the output resources of I / O subsystem 26 to receive status information and other outputs from mobile phone 11. For example, a user can press button 261 to turn the phone on or off.

[0089] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0090] The above embodiments merely illustrate several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. An antenna assembly, characterized in that, include: A first radiator has at least one first slit, the first slit dividing the first radiator into at least a first radiating branch and a second radiating branch, the first radiating branch having a feed end away from the first slit. The second radiator is located on the side of the first radiator away from the feed end, forming a second gap between it and the second radiating branch, and the second radiator has a grounding end away from the second gap; The feed source, connected to the feed terminal, is used to excite the first radiator and the second radiator to support operation in a dual-resonance mode. The dual-resonance mode includes a main resonant mode generated by the joint excitation of the first radiator and the second radiator, and a parasitic resonant mode generated by the excitation of the second radiator. The main resonant mode and the parasitic resonant mode support different frequency bands.

2. The antenna assembly according to claim 1, characterized in that, The main resonant mode includes a hybrid mode of the first mode and the second mode. The current of the first mode is distributed in the first radiating branch, and the current of the second mode is distributed in the entire arm of the first radiator and the second radiator. The current of the parasitic resonant mode is distributed in the second radiator.

3. The antenna assembly according to claim 2, characterized in that, The first mode includes a quarter-wavelength mode from the feed end to the free end of the first radiating stub, and the second mode includes a circulating mode from the feed end to the ground end and from the ground end to the feed end. Wherein, the first wavelength is the wavelength of the center frequency corresponding to the frequency band supported by the main resonant mode.

4. The antenna assembly according to claim 3, characterized in that, The parasitic resonant mode supports a quarter-wavelength mode including the ground terminal to the free end of the second radiator; Wherein, the second wavelength is the wavelength of the center frequency corresponding to the frequency band supported by the parasitic resonance mode, and the frequency band supported by the parasitic resonance mode is higher than the frequency band supported by the main resonance mode.

5. The antenna assembly according to claim 1, characterized in that, The main resonant mode supports the first frequency band, and the parasitic mode supports the second frequency band; Wherein, the extension dimension of the first radiating branch is one-quarter wavelength of the center frequency corresponding to the first frequency band, and the extension dimension of the second radiator is one-quarter wavelength of the center frequency corresponding to the second frequency band.

6. The antenna assembly according to claim 1, characterized in that, The coupling at the locations of the first fracture and the second fracture includes any one of gap coupling, layered coupling, and interdigital coupling.

7. The antenna assembly according to claim 1, characterized in that, The first radiator and the second radiator extend in the same direction. In the direction of extension, the size of the first radiating branch is larger than the size of the second radiator, and the size of the second radiator is larger than the size of the second radiating branch.

8. The antenna assembly according to any one of claims 1-7, characterized in that, The antenna assembly also includes: At least one of the first tuning circuit and the second tuning circuit; The first tuning circuit is connected to the feed source and the feed terminal respectively, and the antenna assembly is configured to support the adjustment of the center frequency of the main resonant mode through the first tuning circuit, so as to support the switching of the first frequency band covered by the main resonant mode. The second tuning circuit is connected to the ground terminal and the ground plane respectively, and the antenna assembly is configured to support the adjustment of the center frequency of the parasitic resonance mode through the second tuning circuit to support the switching of the second frequency band covered by the parasitic resonance mode.

9. The antenna assembly according to claim 8, characterized in that, The antenna assembly includes a first tuning circuit and a second tuning circuit. The first tuning circuit and the second tuning circuit synchronously adjust the center frequency of the main resonant mode and the center frequency of the parasitic resonant mode to support dual-band dual switching between the first frequency band and the second frequency band.

10. The antenna assembly according to claim 9, characterized in that, When the first tuning circuit adjusts the center frequency of the main resonant mode to a first preset frequency, the second tuning circuit supports adjusting the center frequency of the parasitic resonant mode to a second preset frequency, wherein the first preset frequency is less than the second preset frequency, and the difference between the first preset frequency and the second preset frequency is within the preset frequency range.

11. The antenna assembly according to claim 8, characterized in that, The center frequency of the main resonant mode is in the low frequency range, and the first frequency band includes any one of the B8, B5, and B28 frequency bands. Under the excitation of the feed source, the main resonant mode supports operation in the B8 frequency band; after the feed signal provided by the feed source is adjusted and processed by the first tuning circuit, the first frequency band is switched to either the B5 frequency band or the B28 frequency band.

12. An electronic device, characterized in that, include: floor; The antenna assembly as claimed in any one of claims 1-11, wherein the grounding terminal is connected to the ground plane.

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